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TREE   INVT

this file is built from choose-temp.c
/* Utility to pick a temporary filename prefix.
   Copyright (C) 1996, 1997 Free Software Foundation, Inc.

This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

Libiberty is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB.  If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* This file exports one function: choose_temp_base.  */

/* This file lives in at least two places: libiberty and gcc.
   Don't change one without the other.  */

#ifdef IN_GCC
#include "config.h"
#endif

#ifdef HAVE_SYS_FILE_H
#include <sys/types.h>
#include <sys/file.h>   /* May get R_OK, etc. on some systems.  */
#endif

#ifndef R_OK
#define R_OK 4
#define W_OK 2
#define X_OK 1
#endif

#include <stdio.h> /* May get P_tmpdir.  */

#ifdef IN_GCC
#include "gansidecl.h"
extern char *xmalloc ();
#else
#include "ansidecl.h"
#include "libiberty.h"
#if defined (__MSDOS__) || defined (_WIN32)
#define DIR_SEPARATOR '\\'
#endif
#endif

#ifndef DIR_SEPARATOR
#define DIR_SEPARATOR '/'
#endif

/* On MSDOS, write temp files in current dir
   because there's no place else we can expect to use.  */
/* ??? Although the current directory is tried as a last resort,
   this is left in so that on MSDOS it is preferred to /tmp on the
   off chance that someone requires this, since that was the previous
   behaviour.  */
#ifdef __MSDOS__
#ifndef P_tmpdir
#define P_tmpdir "."
#endif

TOP TREE INVT#endif /* Name of temporary file. mktemp requires 6 trailing X's. */ #define TEMP_FILE "ccXXXXXX" /* Subroutine of choose_temp_base. If BASE is non-NULL, return it. Otherwise it checks if DIR is a usable directory. If success, DIR is returned. Otherwise NULL is returned. */ static char * try (dir, base) char *dir, *base; { if (base != 0) return base; if (dir != 0 && access (dir, R_OK | W_OK | X_OK) == 0) return dir; return 0; }
TOP TREE INVT /* Return a prefix for temporary file names or NULL if unable to find one. The current directory is chosen if all else fails so the program is exited if a temporary directory can't be found (mktemp fails). The buffer for the result is obtained with xmalloc. */ char * choose_temp_base () { char *base = 0; char *temp_filename; int len; static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 }; static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; #ifndef MPW base = try (getenv ("TMPDIR"), base); ® base = try (getenv ("TMP"), base); ® base = try (getenv ("TEMP"), base); ® #ifdef P_tmpdir base = try (P_tmpdir, base); ® #endif /* Try /usr/tmp, then /tmp. */ base = try (usrtmp, base); ® base = try (tmp, base); ® /* If all else fails, use the current directory! */ if (base == 0) base = "."; #else /* MPW */ base = ":"; #endif len = strlen (base); temp_filename = xmalloc (len + 1 /*DIR_SEPARATOR*/ ® + strlen (TEMP_FILE) + 1); strcpy (temp_filename, base); #ifndef MPW if (len != 0 && temp_filename[len-1] != '/' && temp_filename[len-1] != DIR_SEPARATOR) temp_filename[len++] = DIR_SEPARATOR; #else /* MPW */ if (temp_filename[len-1] != ':') temp_filename[len++] = ':'; #endif /* MPW */ strcpy (temp_filename + len, TEMP_FILE); mktemp (temp_filename); if (strlen (temp_filename) == 0) abort (); return temp_filename; }